Add 3rd party Gleam grammar to Supported Languages (#4265)

* add 3rd party Gleam grammar to Supported Languages

* add myself as contributor

Author: folospior

CHANGES.md

@@ -4,6 +4,7 @@ New Grammars:
 
 - added 3rd party Aiken grammar to SUPPORTED_LANGUAGES [Josh Marchand][]
 - added 3rd party VoltScript grammar to SUPPORTED_LANGUAGES [Chester Moses][]
+- added 3rd party Gleam grammar to SUPPORTED_LANGUAGES [Filip Hoffmann][]
 
 Core Grammars:
 
@@ -28,6 +29,7 @@ CONTRIBUTORS
 [Antoine Musso]: https://github.com/hashar
 [Chester Moses]: https://github.com/Chester-Moses-HCL
 [Adam Lui]: https://github.com/adamlui
+[Filip Hoffmann]: https://github.com/folospior
 
 
 ## Version 11.11.1

SUPPORTED_LANGUAGES.md

@@ -91,6 +91,7 @@ The table below shows the full list of languages (and corresponding classes/alia
 | GAUSS                   | gauss, gss             |         |
 | GDScript                | godot, gdscript        | [highlightjs-gdscript](https://github.com/highlightjs/highlightjs-gdscript) |
 | Gherkin                 | gherkin                |         |
+| Gleam                   | gleam                  | [gleam-highlight.js](https://github.com/gleam-lang/gleam-highlight.js) |
 | Glimmer and EmberJS     | hbs, glimmer, html.hbs, html.handlebars, htmlbars | [highlightjs-glimmer](https://github.com/NullVoxPopuli/highlightjs-glimmer) |
 | GN for Ninja            | gn, gni                | [highlightjs-GN](https://github.com/highlightjs/highlightjs-GN) |
 | Go                      | go, golang             |         |